MasterSeal 581 White(formerly ThoroSeal) is a portland cement-based coating for concrete and masonry that provides protection against water, dampness and seepage. Mixed with MasterEmaco A 660, MasterSeal 581 creates a low maintenance and highly durable waterproof barrier that is NSF certified for potable water applications.

Waterproofs and protects building interiors from dampness, moisture, or seepage.

Warning:
This product can expose you to chemicals including SILICA, CRYSTALLINE (AIRBORNE PARTICLES OF RESPIRABLE SIZE), which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

Rated 1 out of
5 by
sbrenner from
Ended up with defective old stockThe bag was full of hard chunks of thoroseal.
Must have been stored too long in a moist warehouse.
Had to run it through a blender.
Very disappointing experience.
No response from customer service.

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